[xsl] Attribute copy -> XSL 1.1

Hello List,
I've a node, and want to copy all attributes stored in an variable into the
node.
<fo:table-cell border-left="{$ATBLayout/Border}" >
<xsl:copy-of select="$flowAttributes/@*"/>
...
</fo:table-cell>
But once I start the saxon processor, I get a errormessage saying:
"Cannot write an attribute node when no element start tag is open"
How can I copy the attributes into the node?
Thank you!
Jan